In FB3, especially with 'Build Automatically' set to ticked,
there is no indication that the compilation completed. If you get
sidetracked having just saved a file, the only way to find out when
it (successfully) compiled is to look at the timestamp on the SWF.
It would be nicer to have something that provides feedback that the
project compiled at hh:mm:ss (and provides reassurance that the
compilation did take place).